Sender ID & identity
Alphanumeric and registered senders for A2P - not DID rental math.
Tag Sender ID on every prepaid debit row
Put Sender ID on every prepaid debit so finance audits burn-by-from-identity on one ledger — no second spreadsheet for OTP, SMS, or multi-sender spend.
Multi-sender ops at volume
Operate many Sender IDs without mixing ledgers or painting fake Live — one registry, per-sender proof, and stop-lines that survive list growth.
Sender reject vs content filter: status truth for finance
Keep sender/registration rejects separate from content-filter outcomes so finance never treats both lanes as delivered prepaid success.
Sender registration gate before production
Do not ship production traffic until sender registration, 10DLC, and toll-free gates are green for every corridor you claim — separate from wallet stops and coverage fallback.
Sender ID choice before the first campaign
Pick alphanumeric vs local DID sender before the first campaign brief — so coverage, hold, and failover plans match the identity you will actually send as.